Crack deflecting microstructure for improved electro-mechanical lifetimes of flexible systems

Megan J. Cordill, Tanja Jörg, Oleksandr Glushko, Robert Franz, Christian Mitterer

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4 Citations (Scopus)


Polymer supported metal thin films for flexible and stretchable applications need to have exceptional electro-mechanical behavior. Typically, brittle metal films thicker than 300 nm will fail at low strains. It will be demonstrated that with residual stress and microstructural tuning, a 500 nm thick Mo film on polyimide has a high crack onset strain and does not fail electrically after 1000 tensile straining cycles of 1% due to a novel zig–zag microstructure. The zig–zag microstructure imparts a crack deflecting behavior which ensures longer lifetimes. As a consequence, a high crack onset strain does not indicate better behavior under cyclic loading conditions.

Original languageEnglish
Pages (from-to)47-49
Number of pages3
JournalMaterials letters
Issue number1 June
Publication statusPublished - 13 Feb 2019

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